The 2003 Porsche Cayenne is available as a 4-door, 5-seat sport utility. Starting at $55,900, the 2003 Porsche Cayenne S is powered by a 4.5L , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated 14-mpg in the city and 20-mpg on the highway. The top of the line 2003PorscheCayenneTurbo , priced at $ 88,900 , is powered by a 4.5L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 13-mpg in the city and 20-mpg on the highway.